This oil does exactely what its supposed to do! Engine is quieter, runs smoother, and stays cooler. Unfortunately for me, my car calls for 5w30 and this is 5w40, thus my avg. mileage, after three tank refill periods, did go down by 1 mpg. (1995 Buick Roadmaster 350/Lt1 w/34000, yes only 34,000 miles). Combo city/hwy 15 mpg to 14 mpg. Oh yea, Walmart will probably be the best price around, however they sell it higher in the stores than online (and they will not honor/price match any online prices or ads, even if you choose the ads for that particular store). So, do their online ship to store option, you will have to pay online but at least you get the discounted price. Plus go to the Shell Rotella site and sometimes they offer a $5 mail in rebate offer to, makes it 14.22 a gallon, not bad!

Get the 5 W-40 vs. the 15W-40. Especially if you're living anywhere the temp goes below 40 degrees often. Check the forums and do the research. No comparison in performance! If you live in a hot climate, the 15W weight is fine. Happy motoring!!

This oil came highly recommended to me by an Atv mechanic for use in my Honda 500 Foremans and Honda 420 Ranchers. I did plenty of research and found that many Atv enthusiasts prefer the full synthetic T6 oils such as Rotella. This oil meets all JASO MA requirements for Motorcycle and Atv wet clutches . JASO MA is the standard for single unit engines where the wet clutch, gearbox and engine used the same oil. JASO-MA oils dont contain friction modifiers that will cause a wet clutch to slip Seems like excellent oil so far. I have also noticed that the engine cooling fan does not come on nearly as much as when I was running standard oils. I will be staying with Rotella 5w-40 T6 for all of my Atvs from here on.

This oil can't be beat for both value and how it handles the old school and new school diesels. Has all the right ingredients to handle my old 12v cummins with ease. Being a 5-40, much better in the winter months compared to the older school 15-40. I get zero burn off and this stuff just works. Highly recommend and have a friend that works in the R

The oil is outstanding!! Your packaging is horrific!! Three separate 1 gal containers in a large box no packaging the box was torn open!! I am not sure what training you give your technician on boxing but they need to be retrained!! Again oil awesome but packaging is disappointing

It’s disappointing that an expensive delivery such as this is essentially left by the road side. This particular Fedex driver recommended I get a drop box, so I did. She still dumps the packages right next to it. Fedex isn’t putting Walmart in a favorable light.

Rosella seems to be the gold standard for diesel engines. From my way of thinking, the T-6 formula has been tuned for maximum protection for diesel engines. The 5W-40 rating would suggest it has been developed as an all season oil. As you can tell by my vagueness, I cannot prove any of these points, it is just my opinion.

Do you have a modern diesel engine? Consider this Group III oil for your lubrication needs. This is a full 'synthetic' oil that is Diesel Particle Filter friendly to control emissions. The 5w-40 oil is good for a cold start and provides protection when at running temperature.

Been around diesel equipment for forty years and have tried other oils but have always gone back to shell Rotella. Check truckers websites, read articles about diesel oils. I would not but anything in my diesel engine except Rotella now for the best grade T6 is what you want .

[This review was collected as part of a promotion.] I do my own work on my diesel vehicles and only run diesel oil made for diesel engines. Shell / Rotella is a great fit for my vehicles and meets the specifications from the vehicle manufacture - Mercedes Benz. I will also investigate to see if this will work in my diesel tractor.